The health care provider will perform a physical exam and ask questions about your symptoms, including:
How long you have had the symptoms
How severe your pain is
How often it occurs
How long it lasts
How often you have diarrhea
Whether you have been traveling
The health care provider can diagnose colitis by inserting a flexible tube into the rectum (flexible sigmoidoscopy or colonoscopy) and evaluating specific areas of the colon. Biopsies taken during these tests may show changes related to inflammation.